If you see a 'Free up space on Drive C' alert during a Windows upgrade

When upgrading from an earlier version of Windows, a "Free up space on Drive C" message might appear on MacBook Air (11-inch, Mid 2012) computers that have a built-in 64 GB flash drive.

Install a full version of Windows instead of using an upgrade version. Upgrade versions can't be installed because the built-in 64GB flash drive can only allocate 34GB of space for a Windows partition. This is not enough free space to accommodate an upgrade installation.

These steps erase the current Windows partition on your Mac. Make sure you have a backup of any important data on your Windows partition before performing these steps.

Use these steps to remove your current installation of Windows and then reinstall a full version of Windows:

Back up your data from the Windows partition.

Start your Mac from OS X.

From the Finder, choose Go > Utilities.

Open Boot Camp Assistant from the Utilities window.

Click Continue, then select the option to "Remove Windows… or later version".

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